Driving-gear for wood-working machines



(No Model.)

L. T. PYOTT. v DRIVING GEAR FOR WOOD WORKING MACHINES.

Patented Feb. 11; 1890.

n. PETERS. Mo-Lilhugraphcr. Wathingiam ma U ITED STATES PATENT OFFICE.

LOUIS T. PYOTT, OF LOIVER MERION, PENNSYLVANIA.

DRIVING-GEAR FOR WOOD WORKING MACHINES.

SPECIFICATION forming part of Letters Patent No. 421,303, dated February11, 1890.

Application filed September 10, 1889. Serial No. 323,551. (No model.)

To all whom it may concern.-

Be it known that I, LOUIS T. PYOTT, a citizen of the United States,residing at Lower Merion, in the county of Montgomery and State ofPennsylvania, haveinvented certain new and useful Improvements inDriving- Gear for W'ood Planing and Molding Machines, of which thefollowing is a full, clear, and exact specification.

My invention relates to improvements in methods of driving thefeed-rolls of wood planing and molding machinery; and my improvementsconsist, first, in providing the upper and lower set of feed-rolls, eachset or line geared together independently in such wise that the relativevertical adjustment of the feed-rolls to suit the thickness or width ofthe material being operated upon does not affect thedriving-connections, and in arranging, 1n connection with the saidseparate sets of feed-rolls and their respective independent trains ofgearing,a single driving-belt for imparting simultaneous movement to thetwo sets of feed-rolls under any variation in their relative adjustment;secondly, in combining with the said separate sets of feedrolls andtheir gearing and the single or common driving-belt, which impartssimultaneous movement thereto, a tightening-pulley arrangedintermediately of the horizontal planes of the driving-pulleys of therespective sets of rolls to tighten the single driving-belt on thebelt-pulleys of both trains of feed-rolls simultaneously, substantiallyas hereinafter described.

In order that the invention may be fully understood, I will proceed todescribe my improved driving mechanism with reference to theaccompanying drawing, which shows a side elevation of an improved doublesurfacing or planing or molding machine with my improvement applied.

In order to obtain all the beneficial results of the roll-drivingmechanism in common use in planing-machines, and at the same time toobviate difficulties and disadvantages existing therein, I employ acompound belt motion consisting of a single belt 1, driven from thepower-shaft 2 at the entry end of the The gearing in connection with thebelt-pul- 5 5 leys is indicated in dotted lines, and does not requirespecific description.

The tightening-pulley 4 is mounted on a lever 6, connected with arack-bar 7 for securing it in any position in which it is set fortightening the belt, or permitting its instantaneous release, so as toslacken the belt on all the pulleys simultaneously. By means of thesingle belt 1, operated by the tightener 4, as described, the gearing inconnection with the top and bottom lines of rolls is brought into actionat the same instant in starting the feed, and the tightener furthermorecompensates for variations which occur when the upper and lower sectionsof the machine are changed in relative distance to operate upon variousthicknesses or widths of material. This method of belting feed isapplicable to either what is known as the fallingbed machine(illustrated in the accompanying drawings) or the old style of planerand molder, where the upper cutter-head is raised and lowered inrelation to the main bed or base of the machine.

One great advantage that is gained by my arran gement is: As the upperand lower lines of rolls are driven by independent trains of gearing,the strength and durability are doubled. If either section breaks, theybecome idle or pressure rolls, and the other section will still drivethe feed.

Having thus described my invention, the following is what I claim as newtherein and desire to secure by Letters Patent:

1. The combination, in a planing-machine, of an upper and a lower lineof feed-rolls, each line geared together independently, driving-pulleys3 5, connected with the upper and lower lines of rolls, respectively,and the driving-belt 1, arranged, substantially as herein shown anddescribed, to impart simultaneous movement to both upper and lower setsof rolls and gearing.

2. The combination, in aplaning machine ranged intermediate of thehorizontal planes of an upper and lower line of feed-rolls, each of saiddriving-pulleys, substantially as set line geared togetherindependently, drivingforth.

pulleys 3 5, each mounted on the shaft of an LOUIS T. PYOTT. 5intermediate pinion 0f the upper and lower XVit-nesses:

lines of rolls, the driving-belt 1, passing over GEO. K. MEOKlfi,

said pulleys, and the tightening-pulley 4, ar- JOHN BREEN.

